Family emblem on Doh

There usually is an emblem right upper side on Doh, fuselage protector of Ken-do.
In Japan, every family have its emblem.

Opponent sometimes hit just beside of my Doh, body protector and give some bruise there.
Of course, I hit armpit to opponent without intention. It's quite natural in Ken-do training.

 
  Left person are hitting Doh.